I produce less code, but better code. Usually if I stay up really late, whatever I worked on after 1 or 2AM ends up being a throwaway. At that hour the logica

I produce less code, but better code. Usually if I stay up really late, whatever I worked on after 1 or 2AM ends up being a throwaway. At that hour the logical abilities in my brain have gone to sleep even if I haven't. I'll come back to the project later and wonder what I was thinking. Then I'll take a mulligan, revert whatever nonsense commits I made after midnight or so, and start over to write it the right way. So all I've done is waste a few hours of good sleep. Also, if I was up until stupid o'clock working on something on one night, I'm not very likely to want to work on it the following night. That loss of momentum is really the biggest thing that can hurt me, as I need constant successes to keep me motivated.